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The Accumax™ AR Barrel Cooler from Caldwell® mounts into the magazine well of any Mil-Spec AR-type tactical rifle to cool the barrel after rapid fire or high volume shooting. A high-pressure fan with dual motor bearings blows air through an integral wind tunnel, directing it through the chamber and into the barrel. A rechargeable 12v Li-ion battery powers the Accumax AR Barrel Cooler for 3-4 hours per charge. (Battery and charger included.)? Manufacturer model #: 390247.